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Topological properties of the solution set of integrodifferential inclusions

Evgenios P. AvgerinosNikolaos S. Papageorgiou — 1995

Commentationes Mathematicae Universitatis Carolinae

In this paper we examine nonlinear integrodifferential inclusions in N . For the nonconvex problem, we show that the solution set is a retract of the Sobolev space W 1 , 1 ( T , N ) and the retraction can be chosen to depend continuously on a parameter λ . Using that result we show that the solution multifunction admits a continuous selector. For the convex problem we show that the solution set is a retract of C ( T , N ) . Finally we prove some continuous dependence results.

Extremal solutions and relaxation for second order vector differential inclusions

Evgenios P. AvgerinosNikolaos S. Papageorgiou — 1998

Archivum Mathematicum

In this paper we consider periodic and Dirichlet problems for second order vector differential inclusions. First we show the existence of extremal solutions of the periodic problem (i.e. solutions moving through the extreme points of the multifunction). Then for the Dirichlet problem we show that the extremal solutions are dense in the C 1 ( T , R N ) -norm in the set of solutions of the “convex” problem (relaxation theorem).

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